package com.hg.miaosha.common.util;

import com.baomidou.mybatisplus.plugins.Page;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

import java.io.Serializable;
import java.util.List;

/**
 * 分页工具类
 *
 */
@ApiModel(value = "分页实体")
@Data
public class PageUtils<T> implements Serializable {
	private static final long serialVersionUID = 1L;
    //总记录数
    @ApiModelProperty(value = "总记录数")
    private int totalCount;
    //每页记录数
    @ApiModelProperty(value = "每页记录数")
    private int pageSize;
    //总页数
    @ApiModelProperty(value = "总页数")
    private int totalPage;
    //当前页数
    @ApiModelProperty(value = "当前页数")
    private int currPage;
    //列表数据
    @ApiModelProperty(value = "分页数据")
    private List<T> list;

    /**
     * 分页
     *
     * @param list       列表数据
     * @param totalCount 总记录数
     * @param pageSize   每页记录数
     * @param currPage   当前页数
     */
    public PageUtils(List<T> list, int totalCount, int pageSize, int currPage) {
        this.list = list;
        this.totalCount = totalCount;
        this.pageSize = pageSize;
        this.currPage = currPage;
        this.totalPage = (int) Math.ceil((double) totalCount / pageSize);
    }

    /**
     * 分页
     */
	public PageUtils(Page<T> page) {

	    if (page == null){
	        return;
        }

		this.list = page.getRecords();
		this.totalCount = page.getTotal();
		this.pageSize = page.getSize();
		this.currPage = page.getCurrent();
		this.totalPage = page.getPages();
	}

    /**
     * 分页 替换数据
     */
    public PageUtils(List<T> list, Page<?> page) {
        this.list = list;
        this.totalCount = page.getTotal();
        this.pageSize = page.getSize();
        this.currPage = page.getCurrent();
        this.totalPage = page.getPages();
    }
}
